.main {
  background: url("../images/login-bg.jpg") no-repeat center;
  background-size: cover;
  overflow: hidden;
  position: relative;
  width: auto;
  height: 910px; }

.content-box {
  width: 300px;
  height: 364px;
  background: rgba(180, 180, 180, 0.4);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  padding: 18px 20px;
  z-index: 10;
  border-radius: 8px; }
  .content-box h1 {
    text-align: center;
    color: #fff;
    margin: 10px 0;
    font-size: 24px; }
  .content-box .text {
    width: 100%;
    height: 38px;
    border: 1px solid #fff;
    background: #fff;
    text-indent: 1em;
    font-size: 14px;
    padding: 0;
    box-sizing: border-box;
    margin-top: 10px; }
  .content-box .submit {
    display: block;
    width: 100%;
    height: 38px;
    border: 1px solid #7fa900;
    margin-top: 30px;
    background: #7fa900;
    color: #fff;
    font-size: 18px;
    font-family: 'Microsoft YaHei';
    transition: background 0.4s;
    cursor: pointer; }
    .content-box .submit:hover {
      background: #94cb00; }
  .content-box .help-text {
    color: #e00;
    text-align: center; }
